Arista not applying DCBX application priorities - Not syncing DCBX to Windows Server with ConnectX-4

Discussion in 'Networking' started by Nomn, May 7, 2019.

  1. Nomn

    Nomn New Member

    Joined:
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    Hi,

    Simple LAB test of RoCE with Arista 7150 not working as expected.
    When querying DCBX status from Arista is says no "0 application priorities configured". See below for config applied.
    Goal is to sync DCBX to windows servers, but it only sync the traffic class, not the port/application defined in the class, obviously, since Arista switch says no application priorities configured.

    Layout;
    Server 2019 with Mellanox ConnectX-4Lx <---> Arista 7150 <---> Server 2019 with Mellanox ConnectX-4Lx
    One cable to one port.

    Latest firmware on switch and NICs

    All prerequisites enabled; LLDP, DCBX, VLAN

    Set port 445 as traffic class 6 on the switch
    Set traffic class 6 on priority level 6 on the switch

    When checking the DCBX settings on the port on the switch it shows that traffic class 6 is set/defined, but no application/port is shown.

    Below are the commands used
    Code:
    #Set DCB Priority Rank to the Traffic Class
    
    SW2(config)#dcbx application tcp-sctp 445 priority 6 
    
    
    
    #Set enhanced transmission selection (ETS) to the specified QoS group
    
    SW2(config)#dcbx ets qos map cos 6 traffic-class 6
    
    
    #Enable DCBX. 
    
    SW2(config)#interface ethernet 2-3
    
    SW2(config-if-Et2-23)#dcbx mode ieee
    
    
    #Enable PFC on all port/interfaces
    
    SW2(config)#interface ethernet 2-3
    
    SW2(config-if-Et2-3)#priority-flow-control mode on
    
    SW2(config-if-Et2-3)#priority-flow-control priority 6 no-drop #Says that no packets are going to be droped by PFC on traffic class 6 when the network is congested
    
    
    #Show DCB settings
    
    show dcbx

    This is the result of the "Show DCBX" command on the switch
    Code:
    Ethernet2:
    
      IEEE DCBX is enabled and active
    
      Last LLDPDU received on Tue May  7 08:49:54 2019
    
      - PFC configuration: willing
    
        capable of bypassing MACsec
    
        supports PFC on up to 8 traffic classes
    
        PFC enabled on priorities: 6
    
      - Application priority configuration:
    
        0 application priorities configured
    
    
    Ethernet3:
    
      IEEE DCBX is enabled and active
    
      Last LLDPDU received on Tue May  7 08:49:39 2019
    
      - PFC configuration: willing
    
        capable of bypassing MACsec
    
        supports PFC on up to 8 traffic classes
    
        PFC enabled on priorities: 6
    
      - Application priority configuration:
    
        0 application priorities configured
    
    
    
    SW2(config-if-Et2-3)#show vlan
    
    VLAN  Name                             Status    Ports
    
    ----- -------------------------------- --------- -------------------------------
    
    1     default                          active    Et1, Et2, Et3, Et4, Et5, Et11
    
                                                     Et12, Et13, Et21, Et23
    
    100   RoCE                             active    Et2, Et3

    Result of the check on the Windows server
    *Only one port on the connectx is connected to the switch. The other is disabled.

    Code:
    Set-NetAdapter -Name "ConnectX-4Lx-Port2" -VlanID 100
    
    
     
    
    
    Get-NetAdapter | select interfacealias,vlanid
    
    InterfaceAlias                vlanid
    
    --------------                ------
    
    ConnectX-4Lx-Port1            0            (DISABLED)
    
    ConnectX-4Lx-Port2            100
    
    
     
    
    
    
    
    Get-NetAdapterQos
    
    Name                       : ConnectX-4Lx-Port2
    
    Enabled                    : True
    
    Capabilities               :                       Hardware     Current
    
                                                       --------     -------
    
                                 MacSecBypass        : NotSupported NotSupported
    
                                 DcbxSupport         : IEEE         IEEE
    
                                 NumTCs(Max/ETS/PFC) : 8/8/8        8/8/8
    
    
     
    
    
    OperationalTrafficClasses  : TC TSA    Bandwidth Priorities
    
                                 -- ---    --------- ----------
    
                                  0 ETS    100%      0-7
    
    OperationalFlowControl     : Priority 6 Enabled
    
    OperationalClassifications : Not Available
     
    #1
  2. kiteboarder

    kiteboarder Member

    Joined:
    May 10, 2016
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    Following, thanks for posting this thread.
     
    #2
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